(1) Storing blood. The liver possesses the function of storing blood and regulating the volume of circulating blood. During rest, part of the blood remains in the liver, while during vigorous activity blood is released from the liver to increase the volume of blood in circulation to the required amount. The liver, therefore, along with the heart, supplies the tissues and organs with blood, and it influences menstruation as well.
(2) Maintaining patency for the flow of qi (vital functions) means that the liver is responsible for harmonious and unobstructed functional activities of the human body, including the following three aspects:
a. The Liver is related to emotional activities, especially depression and anger. Prolonged mental depression or a fit of anger may weaken the liver so that it is unable to promote the unrestrained and free flow of qi. Conversely, dysfunction of the liver is often accompanied by emotional changes such as mental depression and irascibility.
b. The harmonious and free-flowing functional activity of the liver promotes the functioning of the other zang-fu organs, channels and collaterals, especially those of the spleen and stomach in digestion and absorption.
c. This function of the liver also affects bile secretion, it storage in the gall bladder and excretion into the intestines.
(3) Controlling the tendons. The yin and blood of the liver nourish the tendons, keeping them in a normal state of contraction and relaxation. When the liver is supplied with ample yin and blood, the tendons are strong and free in extension and flexion.
(4) Opening itu the eye. Each zang-fu organ has certain influence on the function of the eye. However, because the liver stores blood and its channel directly communicates with the eye, it has a closer relation to ocular function, such as vision and movement of the eye, than other zang-fu organs.
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